How Many Calories Are In One Slice Of Bread? | Quick Facts

Calories In One Slice Of Bread: By Type And Size

Most packaged slices cluster in a narrow band. A typical white slice (29 g) comes in at 77 calories, while a regular whole-wheat slice (32 g) is close to 80. If you grab a denser rye slice, you’ll see about 83. Bigger artisan cuts weigh more, so the number climbs fast.

Bread Type	Typical Slice Weight (g)	Calories (kcal)
White (commercial)	29	77
Whole-wheat	32	≈80
Multi-grain	28	75
Rye	32	83
Sourdough (thick)	56	120

You can check the exact entry for white bread nutrition facts. For heftier loaves, a thicker sourdough slice reaches 120 calories.

If you track intake, setting your daily calorie needs makes bread portions fit smoothly into meals.

What Drives The Calorie Count In A Slice

Slice Weight Is The Big Driver

Calories scale with grams. Bread sits around 250–270 kcal per 100 g. A 25 g slice at 270 kcal/100 g lands near 68 kcal, while a hefty 40 g cut at 260 kcal/100 g lands near 104 kcal. If you own a small kitchen scale, weigh one slice from your usual loaf once; after that, you can eyeball it by thickness.

Flour And Recipe Change The Range

White bread uses refined wheat and often lands in the mid-70s per slice. Whole-wheat and multi-grain can be similar per slice because weight is similar, though they add fiber. Rye runs a touch higher at the same weight. Dense artisan sourdough slices are heavier per slice, so the total jumps even if calories per 100 g are comparable.

Moisture, Air, And Crust

Loaves with more air pockets look big but weigh less per slice. Heavier, lower-hydration breads feel smaller but can carry more grams in each piece. Crust doesn’t change calories by itself; it just nudges water loss and weight.

How To Estimate Bread Calories Without A Label

Use A Simple Two-Number Method

Pick a calorie density (250 and 270 kcal/100 g cover most breads), then multiply by slice weight. If you don’t have a scale, compare thickness with a standard factory slice. If your slice looks half again as thick, budget half again the calories.

Handy Weight-To-Calories Table

Slice Weight (g)	Calories @ 250/100 g	Calories @ 270/100 g
20	50	54
25	63	68
28	70	76
30	75	81
32	80	86
35	88	95
40	100	108
56	140	151

These ranges reflect entries in USDA FoodData Central and matched values on MyFoodData for white, wheat, rye, and multi-grain slices. They’re estimates, but they’re close enough for day-to-day logging.

Bread Slices, Carbs, And Protein

A standard white slice delivers roughly 14 g of carbs and 2–3 g of protein; whole-wheat is similar on calories but brings more fiber. Multi-grain slices often carry 2–4 g protein and around 2 g fiber. Rye sits near 15–16 g carbs with ~1.9 g fiber per 32 g slice. If you’re balancing macros, one or two slices can fit nicely in a mixed meal with some protein and a little fat.

Label lines help here. The white bread page lists 14.3 g carbs and 2.6 g protein per 29 g slice, while rye bread shows 15.5 g carbs and 2.7 g protein per 32 g slice. Multi-grain clocks 12.3 g carbs and 3.8 g protein per ounce.

Toasted Bread: Does Toasting Change Calories?

Toasting removes a little water. The slice gets lighter, so calories per 100 g go up slightly on paper. The total calories in that single piece stay about the same. The crunch just changes texture and weight.

Gluten-Free, Light, And Artisan Loaves

Gluten-Free Slices

Gluten-free breads vary widely. Some brands use starch-heavy blends that match white bread on calories per slice. Others add fat for softness and land higher. Check the label and weigh a slice when trying a new loaf.

Reduced-Calorie Breads

Light loaves shave calories by making slices thinner or boosting fiber. If the slice weighs less, the number drops. A thin 20 g slice at 260 kcal/100 g sits near 52 calories. If fiber is added, satiety tends to improve for the same number.

Artisan And Sourdough

Hearty cuts run heavy. A 56 g sourdough slice clocks about 120 calories on MyFoodData’s branded entries. For thick toast, a single slice often beats two thin ones for the same total.

Common Add-Ons And Calorie Swaps

Spreads

Use teaspoons when you can. Butter, jam, and nut spreads pack energy fast. A thin layer still tastes good and keeps the total tidy. Try whipped butter or thin-cut cheese for flavor with fewer grams.

Savory Toppers

Egg whites, turkey, smoked salmon, hummus, cucumber, or tomato stack well on toast. They move the meal toward a protein-plus-produce pattern that holds hunger.

Sweet Options

Go with sliced banana, a dusting of cinnamon, or a small drizzle of honey. Keep portions small so the bread remains the base instead of the calorie source.

Label Reading Tips For Bread

Serving Size And Slice Count

See how many grams are in one slice on the panel. Brands vary from 20 g up to 40 g or more. The grams per slice explain most of the calorie difference you see across loaves.

Fiber And Protein

Look for at least 2 g fiber per slice if you want staying power. Protein helps sandwiches feel complete, but bread alone won’t carry a meal; use fillings to hit your target.

Sodium And Sugar

Salt varies a lot by brand. Some loaves add sugar for browning and softness. Neither changes calories much per slice, yet they matter for health targets.

Portion Examples You Can Copy

Breakfast

One slice of whole-wheat toast, two egg whites, sliced tomato, and a little olive oil. That keeps the bread near 80 calories and builds a tidy plate under 250 calories when portions are measured.

Lunch

Open-face tuna on one dense slice with crunchy veg. You get flavor and texture without doubling bread calories. If you want two slices, use a lighter loaf.

Snack

Half an avocado smashed over thin toast with lemon and salt. It tastes rich, travels well, and the measured bread keeps calories predictable.

Quick FAQ-Style Clarifications

Are Heels Different?

The first and last slices may be a little smaller or drier. The weight difference is tiny in packaged loaves. Treat them the same unless your scale says otherwise.

Is Homemade Bread Higher?

It depends on slice thickness. Home loaves often cut thicker. If the recipe uses oil, milk, nuts, or seeds, calories per 100 g can rise a bit. Weigh a slice and use the table above.

Does Brand Matter?

Brand recipes differ, but grams per slice still explain most of the spread. Pick a loaf you enjoy and measure a slice once so your log matches what you eat.

Bottom Line On Bread Slices

For most loaves, one slice lands near 70–80 calories. Heavier artisan slices run closer to 100–120. Match the slice to the meal, use measured toppings, and you’ll keep totals clear. Want a simple plan to choose between styles? You might like our white vs whole wheat guide for a deeper look at texture, fiber, and uses.